International Harvester 43 / 45

Coolant capacity & service interval

International Harvester 43 / 45 requires coolant with a capacity of 19,5 liters. Service intervals include checking at 50 hours and changing at 1200 hours. The data covers 5 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
845 XL, XLA (1983-1985)
  • Use: Normal
  • Capacity 19,5 liter
  • Check 50 hours
  • Change 1200 hours
743 (1981-1985)
  • Use: Normal
  • Capacity 19,5 liter
  • Check 50 hours
  • Change 1200 hours
743 XL (1981-1985)
  • Use: Normal
  • Capacity 19,5 liter
  • Check 50 hours
  • Change 1200 hours
745 S (1981-1985)
  • Use: Normal
  • Capacity 19,5 liter
  • Check 50 hours
  • Change 1200 hours
745 XL (1981-1985)
  • Use: Normal
  • Capacity 19,5 liter
  • Check 50 hours
  • Change 1200 hours

Additional Notes

  • The International Harvester 43/45 series cooling system holds 19.5 liters across all listed configurations, which is a moderately large capacity consistent with liquid-cooled agricultural engines designed for sustained field operation.
  • The 743, 743 XL, 745 S, and 745 XL share an identical 19.5-liter cooling system capacity for the 1981-1985 model years, indicating a common engine cooling architecture across those variants.
  • The 845 XL and 845 XLA, covering 1983-1985, also carry a 19.5-liter cooling system capacity, placing the larger 845-series on the same coolant volume as the 743 and 745 variants.
  • A coolant check interval of 50 hours applies under normal use conditions across all five configurations, reflecting the frequency at which coolant level and condition are expected to be verified during regular operation.
  • The coolant change interval is set at 1,200 hours under normal use conditions for all listed configurations. In agricultural equipment, hour-based intervals rather than calendar-based ones are standard, as operating hours more accurately reflect actual engine wear and fluid degradation.
  • The ratio between the check interval (50 hours) and the change interval (1,200 hours) means a coolant check is performed 24 times before a full coolant change is due, under normal use conditions.

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